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Heterogeneity of VELO’s pixels response to a monochromatic Fe55 radioactive source

Horst, Lucas van der (2023) Heterogeneity of VELO’s pixels response to a monochromatic Fe55 radioactive source. Bachelor's Thesis, Physics.


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With the purpose of computing the impact parameters and primary and secondary vertices of proton-proton collisions, the Vertex Locator (VELO) at the Large Hadron Collider beauty experiment has been recently replaced by a new silicon pixel version, set to measure the passage of charged particles. Currently, the pixels in the VELO need to be calibrated. In this study, the heterogeneity of the VELO’s pixels, the nature of their discrepancy and the next steps for a proper calibration are investi- gated. By studying the charged particle flux spectra on each pixel, resultant from a monochromatic Fe55 radiation source, it is found that the individual spectra of the pixels significantly differ from that of the average spectrum. This is presumably due to the small resolution of the pixels, which is increased by six orders of magnitude when examining the average spectrum. Moreover, on account of the fact that no more than 15% of the pixels could be mathematically described, much longer exposure times to a radioactive source are justified to obtain more data and properly calibrate the pixels individually.

Item Type: Thesis (Bachelor's Thesis)
Supervisor name: Bruyn, K.A.M. de
Degree programme: Physics
Thesis type: Bachelor's Thesis
Language: English
Date Deposited: 09 Aug 2023 12:39
Last Modified: 09 Aug 2023 12:39

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